I see two. It has not been a problem for me. They know I go to other therapists. They do not specifically know of each other. I do not talk to either about the other. They are both so called psychodynamic but very very different from each other. I would never consent to them speaking to each other about me.
I have read and been told some therapists have objections to it. I have never heard a compelling reason against it. The reasons I have been told and read about mostly surround the therapist getting their feelings hurt if they think the other therapist is better, more well liked and such (seriously - this is a reason actual practicing therapists gave me when I specifically asked) and that the types of "treatment (which I do not believe they are doing to begin with - none have been willing to try and articulate what such "treatment" would consist of and why it would be the correct way to proceed or why they were approaching me like they did - I don't really think they much know) might interfere with the other one. I don't think it would work if I was inclined to try to play them off of each other or if I discussed one with the other. But as I do not, it seems to work for me. I know there are people who disagree with the idea of seeing two. And for them, seeing two would probably not be a great plan.